mxc_ata.c
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/*
* Freescale iMX51 ATA driver
*
* Copyright (C) 2010 Marek Vasut <marek.vasut@gmail.com>
*
* Based on code by:
* Mahesh Mahadevan <mahesh.mahadevan@freescale.com>
*
* Based on code from original FSL ATA driver, which is
* part of eCos, the Embedded Configurable Operating System.
* Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <command.h>
#include <config.h>
#include <asm/byteorder.h>
#include <asm/io.h>
#include <ide.h>
#include <asm/arch/imx-regs.h>
#include <asm/arch/clock.h>
/* MXC ATA register offsets */
struct mxc_ata_config_regs {
u8 time_off; /* 0x00 */
u8 time_on;
u8 time_1;
u8 time_2w;
u8 time_2r;
u8 time_ax;
u8 time_pio_rdx;
u8 time_4;
u8 time_9;
u8 time_m;
u8 time_jn;
u8 time_d;
u8 time_k;
u8 time_ack;
u8 time_env;
u8 time_udma_rdx;
u8 time_zah; /* 0x10 */
u8 time_mlix;
u8 time_dvh;
u8 time_dzfs;
u8 time_dvs;
u8 time_cvh;
u8 time_ss;
u8 time_cyc;
u32 fifo_data_32; /* 0x18 */
u32 fifo_data_16;
u32 fifo_fill;
u32 ata_control;
u32 interrupt_pending;
u32 interrupt_enable;
u32 interrupt_clear;
u32 fifo_alarm;
};
struct mxc_data_hdd_regs {
u32 drive_data; /* 0xa0 */
u32 drive_features;
u32 drive_sector_count;
u32 drive_sector_num;
u32 drive_cyl_low;
u32 drive_cyl_high;
u32 drive_dev_head;
u32 command;
u32 status;
u32 alt_status;
};
/* PIO timing table */
#define NR_PIO_SPECS 5
static uint16_t pio_t1[NR_PIO_SPECS] = { 70, 50, 30, 30, 25 };
static uint16_t pio_t2_8[NR_PIO_SPECS] = { 290, 290, 290, 80, 70 };
static uint16_t pio_t4[NR_PIO_SPECS] = { 30, 20, 15, 10, 10 };
static uint16_t pio_t9[NR_PIO_SPECS] = { 20, 15, 10, 10, 10 };
static uint16_t pio_tA[NR_PIO_SPECS] = { 50, 50, 50, 50, 50 };
#define REG2OFF(reg) ((((uint32_t)reg) & 0x3) * 8)
static void set_ata_bus_timing(unsigned char mode)
{
uint32_t T = 1000000000 / mxc_get_clock(MXC_IPG_CLK);
struct mxc_ata_config_regs *ata_regs;
ata_regs = (struct mxc_ata_config_regs *)CONFIG_SYS_ATA_BASE_ADDR;
if (mode >= NR_PIO_SPECS)
return;
/* Write TIME_OFF/ON/1/2W */
writeb(3, &ata_regs->time_off);
writeb(3, &ata_regs->time_on);
writeb((pio_t1[mode] + T) / T, &ata_regs->time_1);
writeb((pio_t2_8[mode] + T) / T, &ata_regs->time_2w);
/* Write TIME_2R/AX/RDX/4 */
writeb((pio_t2_8[mode] + T) / T, &ata_regs->time_2r);
writeb((pio_tA[mode] + T) / T + 2, &ata_regs->time_ax);
writeb(1, &ata_regs->time_pio_rdx);
writeb((pio_t4[mode] + T) / T, &ata_regs->time_4);
/* Write TIME_9 ; the rest of timing registers is irrelevant for PIO */
writeb((pio_t9[mode] + T) / T, &ata_regs->time_9);
}
int ide_preinit(void)
{
struct mxc_ata_config_regs *ata_regs;
ata_regs = (struct mxc_ata_config_regs *)CONFIG_SYS_ATA_BASE_ADDR;
/* 46.3.3.4 @ FSL iMX51 manual */
/* FIFO normal op., drive reset */
writel(0x80, &ata_regs->ata_control);
/* FIFO normal op., drive not reset */
writel(0xc0, &ata_regs->ata_control);
/* Configure the PIO timing */
set_ata_bus_timing(CONFIG_MXC_ATA_PIO_MODE);
/* 46.3.3.4 @ FSL iMX51 manual */
/* Drive not reset, IORDY handshake */
writel(0x41, &ata_regs->ata_control);
return 0;
}